Lifting mechanism for horizontal hinged doors

Details Lifting mechanism for horizontal hinged doors Lifting mechanism for horizontal hinged doors

1998-10-01

2000-02-08

Redman, Jerry

Movable or removable closures

With means mounting closure for swinging

With biasing means

16289, 16357, E05F 100

Patent

active

060216069

ABSTRACT:
A horizontal door assembly is provided with pivotal counter balancing spring comprising an upper cylinder and a mating lower cylinder to force the cover of the door to an open position when the door assembly is unlocked wherein the upper cylinder of the counter balancing spring is configured to reduce the forces of the spring on the pivot points of the counter balancing mechanism thereby increasing the life of the counter balancing mechanism. In a preferred embodiment, the counter balancing spring mechanism is made of plastic and has an ear at the upper end thereof with an elongated slot opening the slot having a longitudinal axis substantially parallel to the longitudinal axis of the cylinder for mating with a pin inserted in an opening in a yoke bracket attached to the lower side of the cover. When the cover is in the closed position, the bottom of the cover rests on the upper surface of the ear and the pivot pin is positioned intermediate the elongated slot opening thus reducing the spring forces on both the pivot point of the counter balancing spring mechanism and on the spring mechanism.

REFERENCES:
patent: 2939738 (1960-06-01), Lyons
patent: 3651539 (1972-03-01), Breunich et al.
patent: 4430770 (1984-02-01), Niekrasz et al.
patent: 5205073 (1993-04-01), Lyons, Sr.
patent: 5704569 (1998-01-01), Daniels

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